19.
400 persons, working 9 hours per day complete
¼ th of the work in 10 days. The number
of
additional persons. Working 8 hours per day, required to complete the remaining
work in 20 days, is
[A]
675
[C]
250
[B]
275
[D] 225
Answer : B
Explanation :
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Let
the number of persons completing the work in 20 days be x.
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Work
done =
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,
Remaining work =
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1
-
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=
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Less
hours per day, More men required (Indirect Proportion)
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More
work, More men required (Direction Proportion)
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More
days, Less men required (Indirect Proportion)
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Hours
per day
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8
: 9
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Work
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Days
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20
: 10
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::
400 : x
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8 x
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x
20 x x = 9 x
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x
10 x 400
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Additional
men = (675 – 400) = 275
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